And lucky for us on Phantom Power, a large portion of Mattern’s story is about sound, from the echoes of ancient caves to Roman amphitheaters to telephone wires and radio towers—she shows us how sonic infrastructures allow us to communicate and form communities, cultivating forms of intelligence that are embodied and affective, as well as informatic. Before there was the smart city, there was the sonic city—and the sonic city isn’t going anywhere soon.